The soil mobility of atrazine and some ofitsphotodegradationintermediates,4,6-diamino-2-chloro-1,3,5s-triazine(I), and 2,4,6-trihydroxy-1,3,5-s-triazine(II), was evaluated by measuring partition coefficients on five European representative top soils using classical batch experiments. From this study(I) and (II) appear to be more mobile than atrazine itself, especially for typical agricultural soils. Consequently, (I) and particularly (II), tend to reach the saturated zones, and, hence, the groundwater. In order to remove these compounds from groundwater prior to making it drinkable, photocatalytic degradation onto membranes immobilizing 30+-3 wt.% TiO2 has been investigated, as a possible technology to mineralize these waters satisfactorily.